Technical data sheet 22DTH-15..

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Duct sensor Humidity / Temperature

For measuring the relative or absolute humidity and temperature in duct applications. Instead of the humidity signal, the enthalpy or the dewpoint can be selected as an output signal. With Modbus RTU communication and integrated 0...10 V outputs. Nema 4X / IP65 rated enclosure.

Type Overview

Type CommunicationOutput signal

active temperature

Output signal active humidity Probe length

22DTH-15M Modbus RTU 0...5 V, 0...10 V 0...5 V, 0...10 V 140 mm22DTH-15Q Modbus RTU 0...5 V, 0...10 V 0...5 V, 0...10 V 270 mm

Technical data

Electrical data Nominal voltage AC/DC 24 VNominal voltage range AC 19...29 V / DC 15...35 VPower consumption AC 1.8 VAPower consumption DC 0.7 WElectrical connection Pluggable spring loaded terminal block max.

2.5 mm²Cable entry Cable gland with strain relief 2 x Ø6 mm

Functional data Sensor Technology Polymer capacitive sensor with stainless steel wire mesh filter

Application AirCommunicative control Modbus RTUVoltage output 2x 0...5 V, 0...10 V, min. load 10 kΩOutput signal active note Output 0...5/10 V with Jumper adjustable

Measuring data Measured values Relative humidityAbsolute humidityDew pointEnthalpiesTemperature

Measuring range humidity Adjustable via ModbusDefault setting: 0...100% RH

Measuring range temperature Adjustable via ModbusDefault setting: -20...80°C [-5...175°F]Attention: max. measuring temperature is restricted by max. fluid temperature (see Safety data)

Measuring range absolute humidity Adjustable via ModbusDefault setting: 0...80 g/m³

Measuring range enthalpy Adjustable via ModbusDefault setting: 0...85 kJ/kg

Measuring range dew point Adjustable via ModbusDefault setting: -20...80°C [-5...175°F]

Accuracy humidity ±2% between 0...80% RH @ 25°CAccuracy temperature active ±0.3°C @ 25°C [±0.54°F @ 77°F]

Technical data sheet 22DTH-15..

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General remarks concerning sensors

Measuring data Long-term stability ±0.3% RH p.a. @ 21°C @ 50% RH±0.05°C p.a. @ 21°C [±0.09°F p.a. @ 70°F]

Time constant τ (63%) in air duct Relative humidity: typical 10 s @ 3 m/sTemperature: typical 125 s @ 3 m/s

Materials Cable gland PA6, blackHousing Cover: PC, orange

Bottom: PC, orangeSeal: NBR70, blackUV resistant

Safety data Ambient humidity Max. 95% RH, non-condensingFluid humidity Short-term condensation permittedAmbient temperature -35...50°C [-30...120°F]Fluid temperature -40...80°C [-40...175°F]Operating condition air flow max. 12 m/sProtection class IEC/EN III, Safety Extra-Low Voltage (SELV)Power source UL Class 2 SupplyEU Conformity CE MarkingCertification IEC/EN IEC/EN 60730-1Certification UL cULus acc. to UL60730-1A/-2-9/-2-13, CAN/CSA

E60730-1/-2-9Degree of protection IEC/EN IP65Degree of protection NEMA/UL NEMA 4XQuality Standard ISO 9001Mode of operation Type 1Pollution degree 3Rated impulse voltage supply 0.8 kVConstruction Independently mounted control

Safety notes

This device has been designed for use in stationary heating, ventilation and air-conditioning systems and must not be used outside the specified field of application. Unauthorised modifications are prohibited. The product must not be used in relation with any equipment that in case of a failure may threaten humans, animals or assets.Ensure all power is disconnected before installing. Do not connect to live/operating equipment.Only authorised specialists may carry out installation. All applicable legal or institutional installation regulations must be complied during installation.The device contains electrical and electronic components and must not be disposed of as household refuse. All locally valid regulations and requirements must be observed.

Remarks

Sensing devices with a transducer should always be operated in the middle of the measuring range to avoid deviations at the measuring end points. The ambient temperature of transducer electronics should be kept constant. The transducers must be operated at a constant supply voltage (±0.2 V). When switching the supply voltage on/off, onsite power surges must be avoided.

Technical data sheet 22DTH-15..

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Build-up of self-heating by electrical dissipative power

Application notice for humidity sensors

Temperature sensors with electronic components always have a dissipative power which affects the temperature measurement of the ambient air. The dissipation in active temperature sensors shows a linear increase with rising operating voltage. The dissipative power should be taken into account when measuring temperature. In case of a fixed operating voltage (±0.2 V) this is normally done by adding or reducing a constant offset value. As Belimo transducers work with a variable operating voltage, only one operating voltage can be taken into consideration, for reasons of production engineering. Transducers 0...10 V / 4...20 mA have a standard setting at an operating voltage of DC 24 V. That means, that at this voltage, the expected measuring error of the output signal will be the least. For other operating voltages, the offset error will be increased by a changing power loss of the sensor electronics.If a readjustment directly at the active sensor should be necessary during later operation, this can be done with the following adjustment methods.- For sensors with NFC or dongle by the corresponding Belimo app- For sensors with a trimming potentiometer on the sensor board- For bus sensors via bus interface with a corresponding software variable

Refrain from touching the sensitive humidity sensor element. Touching the sensitive surface will void warranty.When exposed to harsh environmental conditions such as high ambient temperature and/or high levels of humidity, or presence of aggressive gases (i.e. chlorine, ozone, ammonia), the sensor element may be affected and readings may be outside the specified accuracy. Replacement of deteriorated humidity sensors due to harsh environmental conditions is not covered by the general warranty.The sensor shows best performance when operated within recommended normal temperature range of 5...60°C and humidity range of 20...80% RH. Long-term exposure to conditions outside normal range, especially at high humidity, may temporarily offset the humidity signal (e.g. +3% RH after 60h kept at >80% RH). After returning into the normal temperature and humidity range, the sensor will slowly come back to calibration state by itself.

Scope of delivery

Scope of delivery Description TypeMounting flange for duct sensor 19.5 mm, up to max. 120°C [248°F], Plastic

A-22D-A35

Cable Gland with strain relief Ø6...8 mm

Accessories

Optional accessories Description TypeReplacement filter, wire mesh, Stainless steel A-22D-A06Connection adapter, M20x1.5, for cable 1x6 mm, Multipack 10 pcs. A-22G-A01.1Connection adapter, M20, for cable 2 x 6 mm, Multipack 10 pcs. A-22G-A02.1Mounting plate L housing A-22D-A10

Service tools Description TypeBelimo Duct Sensor Assistant App Belimo Duct

Sensor Assistant App

Bluetooth dongle for Belimo Duct Sensor Assistant App A-22G-A05* Bluetooth dongle A-22G-A05Certified and available in North America, European Union, EFTA States and UK.

Technical data sheet 22DTH-15..

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Service tools connection

Notes

Service

This sensor can be operated and parametrised using the Belimo Duct Sensor Assistant App.When using the Belimo Duct Sensor Assistant App, the bluetooth dongle is required to enable communication between the app and the Belimo sensor.For the standard operation and parametrisation of the sensor the bluetooth dongle and the Belimo Duct Sensor Assistant App are not needed. The sensor will arrive pre-configured with the factory default settings shown above.

Requirement:- Bluetooth dongle (Belimo Part No: A-22G-A05)- Bluetooth-capable smartphone- Belimo Duct Sensor Assistant App (Google Play & Apple App Store)

Procedure:- Plug the Bluetooth dongle into the sensor via the Micro-USB connector or by means of the interface PCB- Connect Bluetooth-capable smartphone with Bluetooth dongle- Select parametrisation in the Belimo Duct Sensor Assistant App

Wiring diagram

Supply from isolating transformer.The wiring of Modbus RTU (RS485) is to be carried out in accordance with applicable regulations (www.modbus.org). The device has switchable resistors for bus termination.Modbus-GND: Supply and communication are not galvanically isolated. Connect earth signal of the devices with one another.

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Detailed documentation

① and ⑤: Status LED② red: Error③ yellow: Tx④ yellow: Rx

Connectors ST+ / ST- are only used for sensor types which additionally have a passive resistance sensor element for temperature measurement.The adjustment of the measuring ranges is made by changing the bonding jumpers.The output value in the new measuring range is available after 2 seconds.

The separate document Sensor Modbus-Register informs about Modbus register, addressing, parity and bus termination (DIP1: address, DIP2: baud rate, parity, bus termination)

Wiring RS485 Modbus RTU

Dimensions

L = Probe length

Type Probe length Weight22DTH-15M 140 mm 0.26 kg

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Type Probe length Weight22DTH-15Q 270 mm 0.30 kg